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Multi-Expanded Porphyrin Assemblies on Cyclophosphazene Scaffolds

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Title Multi-Expanded Porphyrin Assemblies on Cyclophosphazene Scaffolds
 
Creator KAUR, T
KHAN, TK
RAVIKANTH, M
 
Subject EXCITED-STATE PHOTODYNAMICS
ENERGY-TRANSFER
ENHANCED TRANSPORT
ELECTRON-TRANSFER
ANION-BINDING
CORE
SAPPHYRIN
SQUARE
RING
METALLOPORPHYRINS
Macrocycles
Porphyrinoids
Phosphazenes
Thiasapphyrin
UV/Vis spectroscopy
 
Description Cyclotriphosphazene and cyclotetraphosphazene appended with six and eight sapphyrin units, respectively, were prepared by treating N3P3Cl6 and N4P4Cl8 with the appropriate equivalents of 5,10,15-tri(p-tolyl)-20-(4-hydroxyphenyl)-25,27,29-trithiasapphyrin in tetrahydrofuran (THF) in the presence of Cs2CO3 at temperatures of 0 to 60 degrees C for 8-12 h. The two multi-expanded porphyrin assemblies were soluble in common organic solvents, and their identities were confirmed by their corresponding molecular ion peak in the MALDI-TOF mass spectra. 1D and 2D NMR spectroscopic techniques were used to deduce the molecular structures of the mult-expanded porphyrin assemblies. Absorption spectral studies showed that the band positions of the multi-sapphyrin assemblies were similar to that of the monomeric sapphyrin, but the extinction coefficients were three-to fourfold higher than that of the monomeric sapphyrin. The multisapphyrin assemblies are not very stable under redox conditions.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2016-01-14T10:38:53Z
2016-01-14T10:38:53Z
2015
 
Type Article
 
Identifier EUROPEAN JOURNAL OF ORGANIC CHEMISTRY(14)3157-3163
1434-193X
1099-0690
http://dx.doi.org/10.1002/ejoc.201500131
http://dspace.library.iitb.ac.in/jspui/handle/100/17380
 
Language en